Improvement in sewing-machines



11. WILLIAMSON. Sewing-Machine.

r No. 206,513. ,Patente dlu ly 30,1878.

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w 14 INVENTOR VIIIIIII/IlIIIIIIIIIIIIIIIIlllllfl ATTORNEYS.

N. PETERS, PNOT0-LITHOGRAPMER, WASHINGTON. D E- UNITED STATES PATENTOFFICE.

DANIEL WILLIAMSON, OF SUNBURY, PENNSYLVANIA, A SSIGNOB TO DANIEL BEOKLEYAND SYBILLA VILLIAMSON, OF SAME PLACE.

IMPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. 206,513, ated July 30,1878; application filed April 20, 1878.

To all whom it may concern:

Be it known that I, DANIEL WILLIAMSON, of Sunbury, in the county ofNorthumberland and State of Pennsylvania, have invented a new andImproved Sewing vlachine, of which lshe following is a specification:

In the accompanying drawing, Figure 1 repsents a side elevation of myimproved sewing-machine; Fig. 2, a vertical transverse sec tion of thesame on line x m, Fig. 1 Fig. 3, an end elevation, with face-plateremoved to show resser-foot and feed-bar; and Fig. 4, a

, horizontal section on line 3 y, Fig. 3, showing table, and B thehorizontal supporting-arm, of

my improved sewing-machine. The drivingshaftC turns in suitable bearingsof the horizontal arm, and is revolved either by a handcrank or by footor other power, as desired.

The shuttle-motion is obtained by a fixed cam-wheel, D, that is placedobliquely on the driving-shaft O, and which engages a loose plate, D,with elongated center slot, that follows readily the motion of theoblique cam. The loose plate 1) is provided at diametricallyoppositepoints with lugs a, that project beyond the circumference of the fixedcam, and engage recesses of the semicircular forked end E of theshuttle-driver E.

The shuttle-driver E is made of one continuous piece, and bent in theshape of a right angle at that point where it passes below the table Ato'the shuttle-race. 1t passes through a hole of the table A, that isprovided with bearings for the shuttle-driver, and suitable means forpreventing a change of position in a vertical direction.

The revolving driving-shaft, oblique cam, and loose plate impart areciprocating motion to the lower horizontal end of the shuttledriver.The shuttle-motion is thus given in a very simple and effective mannerwithout any gearing or mechanism below the sewing-machine table.

To the front end of the driving-shaft C is keyed a double eccentric-cam,F F which revolves in the guide-casing of the needle-bar, presser-foot,and feed-bar. A needle-bar of the customary construction is used, thesame being indicated in dotted lines in the drawing, and operated by'theusual V-groove of the double cam. The inner smaller cam, F, engages anelbow-lever, G, that is fulcrumed at its angular part to the pressenbar,and is carried by the'camto one side and returned by the action of asuitable spring, d.

A second spring, (1, presses the elbow-lever downward, together with thepressure-foot H. The pressure-foot H is guided in top and bottom slotsof the casing, and raised and lowered alternately with the feed-bar H.The feed-bar is guided in similar manner in the casing, and movedforward and back simultaneously with itsup-and-down motion by alever-rod, G, that is pivoted to the upper part of casing, and actuatedby the larger cam, F, by means of a" set-screw, f, which bears on saidcam. The lower recessed part of the swinging bar G engages the lowerpart of feed-bar H, which is hung by a pivotpin at its supper end'to theouter end of the horizontal arm of the fulgi iifiied elbow-lever G, sotl'fgtitlthe foot is raised'angl the feed-bar lowcred, a compoundinotion being thus imparted to the feed-bar in connection with theswinging leverbar G, that is retained in contact with the cam Fby aspring, (1, which is also applied to the elbow-lever.

The swinging lever-bar is retained in contact with the cam F by thepresser-spring d, which is also applied to the elbow-lever G. Therevolution of the driving-shaft operates alternately the foot andfeed-bar, imparting vertical reciprocating motion to the former. and acompound reciprocating and forward and backward motion to the latter bya double calm and lever mechanism, which also imparts and feed-bar H,arranged as and for the pnrmotion, in the usual manner, to the needlebar. pose specified.

Having thus described my invention, I

claim as new and desire to secure by Letters DAM IEL WILLIAMSON Patent-\Vitnesses The combination, with the cams F F, of F. LOCH, the levers GGr springs (Z d, resser-foot I-I, JACOB HUN-SEEKER.

